Writing instrument



FIG. 1 is a right front perspective view of a writing instrument showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right front perspective view with the writing tip in an extended position;

FIG. 7 is a top plan view of FIG. 6; and

FIG. 8 is a bottom plan view of FIG. 6. 

The ornamental design for writing instrument, as shown and described. 